Denshi Jisho — Online Japanese dictionary

話題 わだい topic; subject
Common word, Noun, No-adjective 
話題 わだいさく much-discussed work (book, film, etc.)
Noun 
話題になる わだいになる to be in the news; to be talked about; to become a popular topic of conversation; to become the talk of the town; to become topical
Expression, Godan verb with ru ending 
話題沸騰 わだいふっとう being much talked about; creating a stir; being the talk of town
Noun 

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